GMC Sierra 3500HD (2014) is 489 mm (19.25 inch) longer, 112 mm (4.41 inch) wider, 160 mm (6.30 inch) higher and has 831 liters (29.35 ft3) bigger cargo space than Mercedes X-Class (2020).
Mercedes X-Class (2020) is 461 kg (1,016 lbs) lighter than GMC Sierra 3500HD (2014).